Method of and machine for grinding in valves and cocks



K. MARTIN June 20, 1933.

METHOD OF AND MACHINE FOR GRINDING IN VALVES AND COCKS Filed Oct. 24, 1929 Patented June 20,1933

V uivlrllsnI STATES KARL MARTIN, OF GLOGA, CrlEiRlVIANYv METHOD OF AND MACHINE FORA GBJVNDNG IN VALVES AND COCKS v Application inea october 24,1929, sei-iai Nu 402,726?, and in Germany August 1s, 192s.

My Vinvention relates to the art of grinding in or of regrinding valve bodies or plugs so asto make them fit snugly in the Valve casing or seat. In ycarrying out such a grinding operation manually, the casing or seat usual ly isfiixed and held in fixed position, while the valve body or plug is repeatedly forced into kthe fixed casingor onto the seat more or less violently and, at the same time` slight oscillatory'movement is imparted to the body of the valve or the `plug while the force or pressure eXerted'on thevalve body or plug is gradually decreased.

In manipulating a valve body or plug in this way for the purpose of grinding the same in the seat the amplitude of the reciprocatory or rotary movement thereof, that is to say, the

v length'l of the single grinding action or course Ywill depend upon the leakage of the valve or cock, due to wear. In case of valves or cocks of large size or if the valve or cock under treatment leaks very freely, the operator must apply a more intensive pressure and cause the valve body or plug to perform oscillations of a greater amplitude than if a valve or cock of small size or which leaks moderately only, is to be repaired or attended to.

According to the present invention the grinding operation is accomplished by means of a particular machine adapt'edto work 1n VAnother feature of the machine constructed for carrying out the grinding operav tion in the manner herein pointed out,resides in the provision thereinsof a plurality of grinding devices vadapted to be individually stopped and put out of operat-ionk without thereby interrupting or affecting the operation of the other devices or the machine as a holding the valve or cock to be ground.

I am ware that machines for regrinding valveor cocks are universally known, but as far as my knowledge goes the hitherto suggested machines operate in a manner which is entirely distinct from the mode of operation of my improved machine. In a known type of valve grinding machines the valve member to be reground is caused to rotate permanently in one Vdirection whereby fine grooves'are likely to be produced in the cooperating surfaces of the valve or cock, and in anotherclass of known valve grinding ma- 70 chines the necessary pressure to be applied to the moving valve member, is produced by springs or weights so that the pressure cannot be changed or adjusted, or, afterthe machine has been stopped, only in amanner which will be very troublesome, while any such adjustments of the pressure cannot be effected in machines of this known class during the grinding operations. Further all of the known machines are constructed and ar- Yranged to provide only one or at best .two

grinding .facilities or devices and require stopping as a unit when a valve or cock has been finished and a new one is to be inserted.

I will now proceed to describe my invention more in detail in connection with the embodiments thereof constituting the machine andV illustrated on the accompanying drawing, it being'intended and understood that the invention is illustrated by, but noty limited to the embodiments thereof so illustrated and described. v

A preferred and practical embodiment of the invention is shown in the accompanying drawing, in which: Y 95 Figure l is a view in side elevation of the machine, ypartly in section on the'line I-I of Figure 2 which is a view in top plan of the same; i

Figure 3 is a view lin cross-section taken 100 on the line III-III of Figure 2 with a cam shaft mounted on and above the table.

Referring to the construction of the machine shown in Figures 1 to 3 the intermediate shaft 2 and the cam shaft 3 are drivenby means of the pulley 1 and suitable belting or in any other, appropriate manner. Keyed to the shaft ofthe driving pulley 1 is a crankdisk 4 provided with a radially adjustableA pin 5 pivotally connectedl with a push-.rod 6 the other end of which engages a rack 7 4 mounted so as to be displaceable lengthwise in a horizontal plane. Accordingto the ad" justinent of thecrank pin 5 of the ydisk 4 the rack 7 will be moved or rdisplaced horizontally Vmore k or less inthe one orthe other ldirection and, asthe rack 7 is in engagement with two or several toothed wheels 8 each keyed to a vertical grinding shaft 9, the said wheels 8 and the shaft A1 will be caused, by the movements of the rack 7 to revolve in the one or the other. direction depending upon the direction in which the rack moves. The" the machine.

Vhenthe toothed wheel 8 has been shifted lengthwise on its supporting shaft 9 and its square hub portion caused to engage the square stud 11, the shaft 9 will be locked and prevented from rotation. The upper or free end ofthe shaft9 is 'providedwith a means,- -such as awthreaded pin 9or the like, for

detacliably connecting a valve body or a plug 'to be reground with the shaft 9, see Fig..3, so

that when the corresponding toothed wheel '8 has been put in gear,.the valve body or plug will be caused by the shaft to reciprocate simultaneously and vin unison with the reciprocatory movements of the shaft.

`Firmly attached to the table of the machine and located to coaxially surround the upper end of the shaft 9 is a supporting'w basket 13 for the accommodation ofthe casing of the valve or cock to be reground and for firmly holding the same during the grinding operation.y It goes without sayingthat separate baskets are provided inthe machine one for or in connection with each shaft- 9, and that the baskets are constructed and shaped to conform to ,theparticular shape and size of the valve or cocks to be reground. n Journalled in suitable bearings on the table and parallelthereto is the cam shaft 3 ywhich is equipped with'as many cams 14 as grinding shafts 9 are provided in the machine, and the cams 14 are located in front of the shafts z9, as will be seen in Figure2.

' armed lever 18.

Intermediate between the shaft 9 and the cam 14 there is fixed to the table a lug 15 with a pin 16 serving to pivotally support or fulcrum Va single-armed lever 17 and a twoa threaded spindle 19 the lower end of which engages and rests upon onearm of the other lever 18. The lever 17 is of'siniicient length to normally project into the path of the cam 14 so that when the shaft 3 revolves,tlie cani v14 will move the' lever 17 downward. The amplitude of this angular' movement rof the lever 17 about its pivot 16V can be controlled and adjusted at any time` by means of the threaded spindle or screw 19 and as the lever 18 is `actuated by the lever 17, also the operat- :inf amplitude or angle of oscillation of the lever 18 ycan be controlled and adjusted during" the operation of the machine by means of the screw 19.`v Y

The outer arm ofthe lever 18 is shaped to form a fork engaging in an annulargroove provided in the peripheral surfaceof a cy-` lindrical ring 20 adapted to supportthecasing of the valve or cock to be ground and which vencloses the bearing bushing 21 of the grinding shaft 9. -The ring 20 is lifted or displaced upward by the lever 18 operated by the cam 14 and lever 17 during each revolution of the shaft 3, that is, each time the direction i" of the movement of the rack 18 changes. The

casing 22 of the valve or cock` to be reground rests in the basket 13 above `the supporting ring 20, with slight free play, soaasto be adapted to be removed and raised from the valve body or plug to be ground in, once each revolution of the cam shaft 3.

It will be seenthat the force of the impact of the casing dropping back onto the valve body or plug after such raising movement and consequently the initial grinding pressure will depend upon the distance or height the casing had been'lifted from the mating valvev body or plug. u i f. The grinding operation or process comi p rises two stages. In the first stage or period an. adjustable grinding pressure of greater force will be applied while in the sec- `ond stage or period acontinuous low grinding pressure prevails which will substantially correspond 4to the gravity vor weight of the casing to be reground. In this wayl an y'absolutely perfect and excellent grinding eifect will be attained, similar to hand'work` and binding, sticking or jamming between the casing and the valve body or plug cannot occur. The lifting altitude or strokevof the casing which is `equivalent lto the impact force of the dropping casing andconsequent- 1y the initial grinding pressure may be varied in a-ready, efficient manner during operation by varying or adjustingthe position of the lever 17 with relation to the lever 18, by means of'. the set screw 19.` y

Mounted in the lever 17 is In case of grinding valves or cocks which are excessively worn out and leaky, the grinding stroke, that is to say, the revolving angle or stroke of the grinding shaft 9 may be increased to a maximum in addition to the d escribed increase of the grinding pressure. This can be done in a simple way after the machine has been stopped by adjusting the crank pin 5 so that the same will occupy its extreme outermost position in the disk 4f whereby the stroke of the rack 7 or the horizontal reciprocation thereof will be a maximum and also the angular movement or reciprocation of the wheels 8 will come to a maximum.

As regards the operation of the machine it is immaterial whether the casing ofthe valve or cock is ixed and the valve body or plug is caused to oscillate or, vice versa, the latter is lixed and the casing caused to alternately revolve in both directions.

My invention in its broadest aspect is not limited to the particular construction shown tionship, and will be properly mounted and a supported according to the tenets of machine construction; nor have I attempted to illustrate the parts in their exact sizes and dimensions as many of the parts are conventionally shown.

It is unnecessary to reiterate the operation of the machine, for the operation of lthe several parts has been described in detail. Nor does it` seem necessary to burden this specification with a full exposition of the advantages which the invention possesses, Jfor theyhave been partly discussed in the introductory portion of this specification and, in all other respects, will be apparent to those skilled in theart to which this invention pertains. v

' What I claim is:-

1. A valve grindingmachine comprising a support for a member having a valve seat, a support for a valve to be ground against the seat of said member, rack and pinion means n for oscillating the latter supp-ort, cam means for reciprocating the iirst mentioned support to alternately move the member having the valve seat away from and into engagement with the valve, and means for varying the amplitude of reciprocation of said first mentionedrsupport, said last named means comprising a pair of levers between the cam and the iirst mentioned support cooperating with said support and said cam and each other to transmit movement of the cam to the support, and adjustable screw means to vary'the movement imparted to said levers by said cam.

2. In a valve grinding machine, a vertically movable support for a member having a valve seat, a support for a valve to be ground against t-he seat of said member,A means for oscillating the latter support, a cam, an intermediately pivoted lever engaged at one end with said iirst mentioned support, another lever pivoted at one end and having its other end disposed Jfor cooperation with said cam, and a screw member carried by said second mentioned lever whereby the cam is adapted to eiect reciprocation of said iirst mentioned su )port and whereby the amplitude of the reciprocations of said iirst mentioned support may be varied.

3. In a valve vgrinding machine, means for supporting a member having a valve seat, an oscillatory shaft for supporting a valve tobe ground against the seat of said member, a reciprocal rack, a gear splined to said shaft for movement between two positions in one of which it meshes with said rack and -in the other of which it is disengaged from said rack, means with which said gear is engageable in its latter position to hold the shaft against oscillation, and means for shifting said gear between said two positions In testimony whereof I have aiixedmy signature.

KARL MARTIN, 

